class_docstr: Wrap an errno style error.
  
  Parameters
  ----------
  errno : int
      The ZMQ errno or None.  If None, then ``zmq_errno()`` is called and
      used.
  msg : string
      Description of the error or None.
code: def __repr__(self):
      return "%s('%s')" % (self.__class__.__name__, str(self))
  
imports: from errno import EINTR
label_desc: Use image node_id 3 for calling the ZMQError obj's underlying member method code with example usage: obj.__repr__() and returns: unknown